react-hook-form 多步表单问题

Question

I'm working on implementation of a multi step form with react-hook-form and my problem is that input fields do not get reinitialized with the form data when I return to the previous page.

I'm using <FormProvider /> component from react-hook-form to inject the form data into the pages and my input components are registered with register method from useFormContext() hook

const CreateAccount = () => {
  const [currentStep, setCurrentStep] = useState(0);

  const methods = useForm<FormData>({
    mode: "onChange",
  });
  const onSubmit = (data) => console.log(data);

  const handleNextStep = () => {
    if (currentStep >= 5) return;
    setCurrentStep(currentStep + 1);
  };
  const handlePreviousStep = () => {
    if (currentStep <= 0) return;
    setCurrentStep(currentStep - 1);
  };

  const renderContent = () => ({
    [RegistrationSteps.UsernameEmail]: <UsernameEmail handleNextStep={handleNextStep} handlePreviousStep={handlePreviousStep} />,
    [RegistrationSteps.Password]: <CreatePassword handleNextStep={handleNextStep} handlePreviousStep={handlePreviousStep} />,
  });

  return (
    <Container maxWidth="sm">
      <FormProvider {...methods}>
        <form onSubmit={methods.handleSubmit(onSubmit)}>
            {renderContent()[currentStep]}
        </form>
      </FormProvider>
    </Container>
  );
};

export default CreateAccount;

Here is what the input fields look like

 const {
    register
  } = useFormContext();


    <TextField
      label="Email"
       {...register("email")}
     />

Even though the form still holds the data in its state, it does not populate into corresponding fields when I switch back and forth between the form pages.

Answer 1

Instead of a single form at a global level, I recommend creating each component in your step as a form with its own instance of useForm() and wrapping steps in a state provider to store data across different steps. That way, you can assign values to the step forms from the respective state using defaultValues option of useForm on initialization.

• You can check out this for the basic architecture that I'm trying to explain.

• defaultValues in useForm